ContentMine is a content mining service designed primarily to work with science articles. It uses processors such as crawlers, scrapers, and visitors to mine data. Metadata from crawlers is stored in the ContentMine catalog in bibJSON format. Developers can call processors and access metadata programmatically using the ContentMine API. The API also has methods for querying which catalog records have been processed and by which processors. There are also methods for querying facts extracted by visitors.